allowed=".+">This regular expression is matched against the body of the response. If a match is found it is captured and added as a metric. For example, if setting is named 'body_match_foo_bar' and a match is found new metric called 'foo_bar' will be added.</parameter>

allowed=".+">This regular expression is matched against the body of the response globally. The first capturing match is the key and the second capturing match is the value. Each key/value extracted is registered as a metric for the check.</parameter>